<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>页面未找到 - 网络五子棋对战游戏</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #1a2a6c, #b21f1f, #fdbb2d);
            height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            color: white;
            text-align: center;
        }
        
        .error-code {
            font-size: 8rem;
            font-weight: bold;
            margin-bottom: 1rem;
            text-shadow: 3px 3px 0 rgba(0, 0, 0, 0.2);
        }
        
        .error-message {
            font-size: 1.8rem;
            margin-bottom: 2rem;
        }
        
        .error-description {
            font-size: 1.1rem;
            margin-bottom: 3rem;
            max-width: 500px;
            line-height: 1.6;
        }
        
        .home-button {
            padding: 12px 30px;
            font-size: 1.2rem;
            background: rgba(255, 255, 255, 0.2);
            border: 2px solid white;
            border-radius: 30px;
            color: white;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .home-button:hover {
            background: white;
            color: #1a2a6c;
        }
        
        .chess-board {
            position: absolute;
            width: 300px;
            height: 300px;
            opacity: 0.1;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background-image: 
                linear-gradient(to right, #fff 1px, transparent 1px),
                linear-gradient(to bottom, #fff 1px, transparent 1px);
            background-size: 20px 20px;
        }
    </style>
</head>
<body>
    <div class="chess-board"></div>
    
    <div class="error-code">404</div>
    <div class="error-message">页面未找到</div>
    <div class="error-description">
        抱歉，您访问的页面不存在。可能已被移动、删除或您输入了错误的地址。
    </div>
    <button class="home-button" onclick="location.href='/'">返回首页</button>
</body>
</html>